Posted by
Edward R Cole on
Mar 13, 2012; 5:24pm
URL: http://elecraft.85.s1.nabble.com/K3-RF-Calibration-RF-output-tp7367721p7369228.html
Bill,
The 25H element was special-ordered thru Radiodan W7RF
<<mailto:
[hidden email]>
[hidden email]>,
who has the ability to run NBS traceable calibration, so with no
better reference, I am taking the readings on the new element as
accurate (and my standard for HF). A little late to save me money on
Bird elements as have 16 ranging from 5w to 2500w, and HF to
1800-MHz. If I had the cash it would be nice to send meter and
elements to Dan for calibration.
A note that may be of interest: I ran the wattmeter calibration on
my K3 and setting 5w to accurately output 5w as indicated by the Bird
25H required changing my WTMR LP setting from 70 to 50. I then ran
the Transmit Gain Calibration and have 12.5w indicated output from
160m-10m. On 6m the 25H is out of freq. range so reads low, but I
have both a 5A and 50A element that indicates I'm getting close to 8w.
I will be interested to see what the output of my new 300w amp runs
at these levels (previously getting 270w with 11.5w; Bird 500H). I
was getting 125w out on 6m with my Mirage A1015G. The Harris
Platinum Amp should provide 10-dB (800w) on 6m.
----------------------------------
Date: Tue, 13 Mar 2012 04:39:11 -0700 (PDT)
From: Bill W4ZV <
[hidden email]>
Subject: Re: [Elecraft] K3: RF Calibration / RF output
To:
[hidden email]
Message-ID: <
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Content-Type: text/plain; charset=us-asci
Edward R. Cole wrote
> I obtained a brand-new calibrated 25H element for my Bird43 power
> meter, today. I checked power out on my K3/10 set to 12.0w.
> 80m = 11w
> 40m = 11w
> 20m = 11.5w
> 15m = 11.5w
> 10m = 11.5w
> all measurements into a Bird 25w coaxial termination
Bird accuracy is +/-5% of full scale (25W for your slug) or +/- 1.25 Watts,
so the above is within spec. If you want better accuracy, consider the
LP-100A which is +/- 5% of reading. At 12 Watts, this would be +/- 0.6
Watts or twice as good as a Bird...and probably cheaper as well considering
the cost of a comparable set of slugs.
http://www.telepostinc.com/lp100.html73, Bill
73, Ed - KL7UW, WD2XSH/45
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BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-?
DUBUS Magazine USA Rep
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"Kits made by KL7UW"
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